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. 2019 May 21;10(5):334. doi: 10.3390/mi10050334

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Top-viewed SEM image of the anodic aluminum oxide (AAO) mold; and (b) top-viewed SEM image of the imprinted PMMA layer on polyethylene terephthalate (PET) substrate.